Feature summary (what you would like to be able to do and where):

https://en.wiktionary.org/w/api.php?action=help&modules=feedcontributions says

tagfilter
Filter contributions that have these tags.

It should say if it means filter in, or filter out.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

Currently it is ambiguous.

Benefits (why should this be implemented?):

E.g., coffee grinds, we filter out.
English needs to be clear.